第一节 井壁失稳的原因及危害 在石油钻井中，井眼稳定(borehole stability )问题是世界范围内普 遍存在的问题。每年由此造成的直径经济损失达数亿美元之巨。
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波动压力是影响井眼稳定的主要因素。
Surge pressure is a major factor which affects borehole stability.
泥页岩井眼稳定是由力学与化学两方面因素共同作用的结果。
Shale stability is influenced by both mechanics and chemistry factors mutually.
用有限元方法进行应力分析及设计保持井眼稳定的泥浆密度。
Porous fluid pressure are also presented by using permeable mechanics method. Finite element model and stress analysis program are developed.
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